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4x+12=51-5x
We move all terms to the left:
4x+12-(51-5x)=0
We add all the numbers together, and all the variables
4x-(-5x+51)+12=0
We get rid of parentheses
4x+5x-51+12=0
We add all the numbers together, and all the variables
9x-39=0
We move all terms containing x to the left, all other terms to the right
9x=39
x=39/9
x=4+1/3
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